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CD7031. TOTS 1B-The Flammability Diagram

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About this collection

The Seagull CBT bank is organised into modules covering safety, shipboard operations, maintenance and other topics. Original module names and codes are retained to help you find the topic you need.

“Seagull CBT — CD7031. TOTS 1B-The Flammability Diagram” contains 19 questions across 1 collection.

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Sample questions and answers

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The flammable limits for the vapours given off by clean products such as motor or aviation gasoline can be represented by those of butane. What is the Lower Flammable Limit of butane?

One correct answer

  • 1.9% by volume in air.✓ Correct answer
  • 5.9% by volume in air.
  • 9% by volume in air.
  • 19% by volume in air.
With reference to the Flammability Diagram, what conditions are shown at point A?

One correct answer

  • The tank contains fresh air, with no hydrocarbon gas, and cannot support combustion.✓ Correct answer
  • The tank atmosphere is too rich to support combustion.
  • The tank atmosphere contains no oxygen, and cannot support combustion.
  • The hydrocarbon gas concentration is at its Lower Flammable Limit.
The flammable limits for the vapours given off by natural gasolines can be represented by those of pentane. What is the Lower Flammable Limit of pentane?

One correct answer

  • 1.5% by volume in air.✓ Correct answer
  • 4.5% by volume in air.
  • 7.8% by volume in air.
  • 21% by volume in air.
With reference to the Flammability Diagram, what conditions are shown at point B?

One correct answer

  • The tank atmosphere is too rich to support combustion.✓ Correct answer
  • The tank atmosphere is too lean to support combustion.
  • The hydrocarbon gas concentration is at its Upper Flammable Limit.
  • The hydrocarbon gas concentration is at its Lower Flammable Limit.
What is the relative density of hydrocarbon gas at concentrations near the Lower Flammable Limit?

One correct answer

  • Approximately 1.0, the same as air.✓ Correct answer
  • Approximately 1.5, heavier than air.
  • Approximately 0.7, lighter than air.
  • Approximately 2.0, much heavier than air.

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